Femring (estradiol acetate) is available in two strengths: Femring (estradiol acetate) 0.05 mg/day has a central core that contains 12.4 mg of estradiol acetate, which releases at a rate equivalent to 0.05 mg of estradiol per day for 3 months. Femring (estradiol acetate) 0.10 mg/day has a central core that contains 24.8 mg of estradiol acetate, which releases at a rate equivalent to 0.10 mg of estradiol per day for 3 months.

Estradiol acetate is chemically described as estra-1,3,5(10)-triene-3,17?-diol-3-acetate.
The molecular formula of estradiol acetate is C20H26O3
and the structural formula is:

The molecular weight of estradiol acetate is 314.41.

What are the possible side effects of estradiol vaginal (systemic) (Femring)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Remove the vaginal ring and seek emergency medical attention if you have fever with nausea, vomiting, diarrhea, muscle pain, dizziness, fainting, and/or sunburn-like skin rash. These may be signs of a life-threatening disease called toxic shock syndrome.

Call your doctor at once if you have any of these serious side effects:

chest pain or heavy...

Read All Potential Side Effects and See Pictures of Femring »

What are the precautions when taking estradiol acetate (Femring)?

Before using estradiol, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Femring Consumer (continued)

Nausea/vomiting, bloating, breast tenderness, headache, or weight changes may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.

Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

This medication may rarely cause serious problems from blood clots (such as heart attacks, strokes, deep vein thrombosis, pulmonary embolism). Get medical help right away if you have any serious side effects, including: chest/jaw/left arm pain, unusual sweating, sudden/severe headache, weakness on one side of the body, confusion, slurred speech, sudden vision changes (such as partial/complete blindness), pain/redness/swelling of legs, tingling/weakness/numbness in the arms/legs, trouble breathing, coughing up blood, sudden dizziness/fainting.

Vaginal rings have rarely caused a very serious (possibly fatal) bacterial infection (toxic shock syndrome-TSS). Remove this product and get medical help right away if you have any symptoms of toxic shock syndrome, including: high fever, sudden dizziness/fainting, unusual muscle pain, sunburn-like rash, diarrhea.

A very serious allergic reaction to this product is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US -

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

PRECAUTIONS: Before using estradiol, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Do not smoke or use tobacco. Estrogens combined with smoking further increases your risk of stroke, blood clots, high blood pressure, and heart attack, especially in women older than 35.

Tell your doctor if you just had or will be having surgery, or if you will be confined to a chair or bed for a long time (such as a long plane flight). These conditions increase your risk of getting blood clots, especially if you are using an estrogen product. You may need to stop this medication for a time or take special precautions.

This drug may cause blotchy, dark areas of the skin on the face (melasma). Sunlight may worsen this effect. Avoid prolonged sun exposure, tanning booths, and sunlamps. Use a sunscreen and wear protective clothing when outdoors.

If you are nearsighted or wear contact lenses, you may develop vision problems or trouble wearing your contact lenses. Contact your eye doctor if these problems occur.

If you get a vaginal infection while using this ring, you may leave the ring in place while the infection is being treated. Consult your doctor or pharmacist for treatment options.

This medication must not be used during pregnancy. If you become pregnant or think you may be pregnant, tell your doctor immediately.

This medication passes into breast milk. It may reduce the quality and amount of breast milk produced. Consult your doctor before breast-feeding.

Femring Patient Information Including Side Effects

Brand Names: Femring

What are the possible side effects of estradiol vaginal (systemic) (Femring)?

What is the most important information I should know about estradiol vaginal (systemic) (Femring)?

What should I discuss with my health care provider before using estradiol vaginal (systemic) (Femring)?

How should I use estradiol vaginal (systemic) (Femring)?

What happens if I miss a dose (Femring)?

What happens if I overdose (Femring)?

What should I avoid while using estradiol vaginal (systemic) (Femring)?

What other drugs will affect estradiol vaginal (systemic) (Femring)?

Where can I get more information?

What is estradiol vaginal (systemic) (Femring)?

Estradiol is a form of estrogen. Estrogen is a female sex hormone necessary for many processes in the body.

Estradiol vaginal (systemic) is used to treat symptoms of menopause such as hot flashes, and vaginal dryness, burning, and irritation.

Some estradiol products placed directly into the vagina are used for "local" treatment of vaginal menopause symptoms involving the secretions and surrounding tissues of the vagina. Other vaginal estradiol products are used for treating menopause symptoms affecting the vagina as well as other parts of the body (such as hot flashes). This type of vaginal estradiol has "systemic" effects, meaning that it can affect parts of the body other than where the medicine is placed or applied.

The information in this leaflet is specific to estradiol vaginal products used for systemic treatment of symptoms.

Estradiol vaginal (systemic) may also be used for other purposes not listed in this medication guide.

What are the possible side effects of estradiol vaginal (systemic) (Femring)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Remove the vaginal ring and seek emergency medical attention if you have fever with nausea, vomiting, diarrhea, muscle pain, dizziness, fainting, and/or sunburn-like skin rash. These may be signs of a life-threatening disease called toxic shock syndrome.

Call your doctor at once if you have any of these serious side effects:

chest pain or heavy feeling, pain spreading to the arm or shoulder, sweating, general ill feeling;

pain, swelling, or tenderness in your stomach, jaundice (yellowing of the skin or eyes); or

a lump in your breast.

Less serious side effects may include:

swollen breasts;

acne or skin color changes;

decreased sex drive, impotence, or difficulty having an orgasm;

migraine headache;

vaginal pain, itching, or discharge;

swelling of your ankles or feet; or

changes in your menstrual periods, break-through bleeding.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What is the most important information I should know about estradiol vaginal (systemic) (Femring)?

Some estradiol products placed directly into the vagina are used for "local" treatment of vaginal menopause symptoms involving the secretions and surrounding tissues of the vagina. Other vaginal estradiol products are used for treating menopause symptoms affecting the vagina as well as other parts of the body (such as hot flashes). This type of vaginal estradiol has "systemic" effects, meaning that it can affect parts of the body other than where the medicine is placed or applied.

The information in this leaflet is specific to estradiol vaginal products used for systemic treatment of symptoms.

Do not use this medication if you have any of the following conditions: a history of stroke, heart attack, or blood clot, a hormone-related cancer such as breast or uterine cancer, or abnormal vaginal bleeding that a doctor has not checked.

This medication can cause birth defects in an unborn baby. Do not use if you are pregnant. Use an effective form of birth control, and tell your doctor if you become pregnant during treatment.

Estradiol increases your risk of developing endometrial hyperplasia, which may lead to cancer of the uterus. Taking progestins while using estradiol may lower this risk. If your uterus has not been removed, your doctor may prescribe a progestin for you to take while you are using estradiol vaginal.

Long-term estradiol treatment may increase your risk of breast cancer, heart attack, or stroke. Talk with your doctor about your individual risks before using estradiol long-term. Your doctor should check your progress on a regular basis (every 3 to 6 months) to determine whether you should continue this treatment.

Have regular physical exams and self-examine your breasts for lumps on a monthly basis while using estradiol.